title: Aging and antimicrobial immunity. Impaired production of mediator T cells as a basis for the decreased resistance of senescent mice to listeriosis.
abstract: Immunity to infection of mice with the facultative, intracellular pathogen Listeria monocytogenes was employed as a model system to investigate the immunological basis for the age-associated decline in anti-microbial immunity. In response to a sublethal immunizing infection, aged (24-mo old or more) mice displayed a smaller increase in spleen weight, spleen cellularity, and splenic T cell content than young (3- to 4-mo-old) mice. Aged mice also generated a smaller number of anti-Listeria protective T cells at the time of a peak response, in that their spleen cells were 1,000-fold less protective than equivalent numbers of spleen cells from the young donors, even when enriched T cell populations were employed. These results suggest that the impaired ability of aged mice to produce protective T cells is mainly responsible for decreased resistance of these mice to infection with Listeria.
mesh_terms: D000375:Aging; D000818:Animals; D007111:Immunity, Cellular; D007114:Immunization; D008089:Listeria monocytogenes / Q000254:growth & development; D008088:Listeriosis / Q000276:immunology*; D051379:Mice; D013154:Spleen / Q000166:cytology / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*